References

Preface    Introduction    Geology    Soil Descriptions    Mapping    Interpretive Maps    References

Dr. Gary Petersen. Personal Communication. November 11, 1999

Soil Survey Manual. Soil Survey Division Staff. USDA. 1993

United States Census Bureau. http://www.census.gov/cgi-bin/popclock. November 14, 1999

William L Braker. Centre County Soil Survey Report. Soil Conservation Service. 1981